package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

//消费者
public class ConsumerQuickStart {
    public static void main(String[] args) {
     //添加kafka的配置信息
        Properties properties=new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9092");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //消费者对象
        KafkaConsumer<String,String>consumer=new KafkaConsumer<String, String>(properties);
        //订阅主题
        consumer.subscribe(Collections.singletonList("itheima-topic"));
        //当前线程一直处于监听状态
        try {
            while (true){
                //获取消息
                ConsumerRecords<String,String>consumerRecords=consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                  /*  try {
                        consumer.commitSync();//同步提交当前的最新的偏移量
                    } catch (Exception e) {
                        System.out.println("记录提交失败的异常"+e);
                    }*/
                  //异步
                   /* consumer.commitAsync(new OffsetCommitCallback() {
                        @Override
                        public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                            if (e!=null){
                                System.out.println("记录错误的提交偏移量"+map+"异常信息"+e);
                            }
                        }
                    });*/
                }
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误信息"+e);
        } finally {
            try {
                consumer.commitSync();
            }finally {
                consumer.close();
            }
        }
    }
}
